A green and reusable catalytic system based on silicopolyoxotungstovanadates incorporated in a polymeric material for the selective oxidation of sulfides to sulfones
| Autor: | Luis Rene Pizzio, Romina Alejandra Frenzel, Valeria Palermo, Angel Gabriel Sathicq, Asma M. Elsharif, Rafael Luque, Gustavo Pablo Romanelli |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Sulfide Chemistry Composite number 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Catalysis Amorphous solid chemistry.chemical_compound Monomer Mechanics of Materials Polymer chemistry Moiety General Materials Science Fourier transform infrared spectroscopy 0210 nano-technology Hybrid material |
| Zdroj: | Microporous and Mesoporous Materials. 310:110584 |
| ISSN: | 1387-1811 |
| Popis: | Two vanadium-containing Keggin silicopolyoxotungsto compounds K5SiVW11O40 and K6SiV2W10O40 were synthesized and characterized. They were incorporated in a superporous hydrogel constitute by prop-2-enamide and propenoic acid as initial monomers and bis-acrylamide as cross-linking moiety. Materials were characterized by several techniques. According to FTIR and 51V MAS-NMR, the (SiVxW12-xO40)(4+x)- anions are the main species present in the hybrid materials. Additionally, they do not decompose during the preparation of the composite. XRD and SEM-EDX results suggest that (SiVxW12-xO40)(4+x)- anions were well dispersed in the support or present as amorphous phases. These materials were evaluated as catalysts in the oxidation of sulfides to sulfones, using an eco-friendly oxidant and mild reaction conditions. The hybrid materials with higher content of the heteropoly compound displayed a remarkable catalytic behaviour in the oxidation of diphenyl sulfide. Materials also exhibited a stable catalytic performance through consecutive reuses. Optimum reaction parameters established were subsequently translated to the oxidation of a sulfide of interest (dapsone) due to its pharmacological activities. |
| Databáze: | OpenAIRE |
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